The detector senses a person is moving (motion) and a switch is set to on. It depends on why the motion sensor was installed. Maybe an warning alarm is sounded, a camera could begin to record, or a light in the room or passageway is turned on.
Motion detectors are: infrared detectors, ultrasonic, microwave, radiowave and... dogs.
technology that makes use of motion detectors
Motion detectors have had a massive impact on today's society. Motion detectors have made life easier for those who are very busy for example.
There are many levels of long range motion detectors, personal use and commercial use. Some motion detectors can detect movement up to 8-10 miles away. Some good brands for long range motion detectors are Honeywell and KNX.
Yes
The first motion detector was invented by Russian Leon Theremin in the year 1920, but the first motion detectors used as a security device were developed in early 1950's by Samuel Bagno. The basis of these first detectors was the Doppler effect and ultrasonic waves application.
Birds
Some cctv security cameras also have motion detectors. If you are looking for a security camera with this feature, you should check the description before you buy it.
home security, motion detectors, have weapons near
Smoke detectors
Julian Kolodko has written: 'Motion vision' -- subject(s): Design and construction, Detectors, Measurement, Motion, Motion control devices
Form is detected by cells called edge detectors, while motion is detected by cells called motion detectors, both of which are present in the visual system. These cells are responsible for detecting specific features in the environment to help with processing visual information.